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Importance of varchar length in MySQL table
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There's one possible performance impact: in MySQL, temporary tables and MEMORY tables store a VARCHAR column as a fixed-length column, padded out to its maximum length. If you design VARCHAR columns much larger than the greatest si...
Is this the right way to clean-up Fragment back stack when leaving a deeply nested stack?
...sible after popbackstack we just finish our fragment without restart older one.
– duggu
Sep 28 '13 at 3:41
Please note...
Rails: How can I set default values in ActiveRecord?
... in your migration also works part of the time... As has already been mentioned this will not work when you just call Model.new.
Overriding initialize can work, but don't forget to call super!
Using a plugin like phusion's is getting a bit ridiculous. This is ruby, do we really need a plugin just to...
What is JSONP, and why was it created?
...you need to cross domain boundaries, a no-no in most of browserland.
The one item that bypasses this limitation is <script> tags. When you use a script tag, the domain limitation is ignored, but under normal circumstances, you can't really do anything with the results, the script just gets e...
Why is React's concept of Virtual DOM said to be more performant than dirty model checking?
...React: Rethinking best practices -- JSConf EU 2013 ) and the speaker mentioned that dirty-checking of the model can be slow. But isn't calculating the diff between virtual DOMs actually even less performant since the virtual DOM, in most of the cases, should be bigger than model?
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Ruby: What is the easiest way to remove the first element from an array?
...ent of an Array is called "shift" ("unshift"
being the operation of adding one element
in front of the array).
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Is there a way to make ellipsize=“marquee” always scroll?
...creen at the same time (like when used in ListView) - because usually only one of them can be focused, but this solution 'tricks' the system by telling it all of them are :) Otherwise for single TextView simpler anwer like stackoverflow.com/a/3510891/258848 should be used.
– di...
How to delete a specific line in a file?
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Why does Python not allow us to do this in one line?
– Ooker
Jul 1 '14 at 16:37
5
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Bash if [ false ] ; returns true
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One can, but it's a really bad idea. ( $A && $B ) is a surprisingly inefficient operation -- you're spawning a subprocess via calling fork(), then string-splitting the contents of $A to generate a list of elements (in...
Could not launch process launch failed: timed out waiting for app to launch
...d this problem when I used a Distribution certificate instead of Developer one when running the app from Xcode. You may check it out your target --> Build Settings --> Code signing.
As @AndyDynn pointed out in his comment:
Make sure you do this on the "Target" build settings and not just the ...